.screen-sharing {
  position: absolute;
  z-index: 2;
  width: 100%;
  height: 100%;
  &::before {
    color: white;
    font-size: 5em;
    content: ' ';
    width: 100%;
    height: 100%;
    text-align: center;
    vertical-align: middle;
    display: block;
    background: black;
    position: absolute;
  }
}